The Stone Slammer is a giant balloon that drops huge rocks on enemy defenses. Each rock deals splash damage upon impact. The Stone Slammer deals extra damage against walls.
Unlike the other Siege Machines, the Stone Slammer does not aim for the Town Hall and does not deploy troops should it reach it. Instead, it always tries to destroy the nearest defensive buildings and only releases troops when destroyed or when the troops are manually released.
Upgrade the Workshop to level 3 to unlock the Stone Slammer.
Donated Clan Castle troops can be deployed at any time, although doing this will destroy the Stone Slammer.
Siege Machines are immune to the effects of Spells.